Wiring structure, display subtrate and display device

ABSTRACT

The present disclosure provides a wiring structure, a display substrate and a display device, and belongs to the field of display technology. The wiring structure of the present disclosure comprises a body portion provided with hollow patterns; the body portion has a first side and a second side which are provided opposite to each other along an extending direction of the wiring structure, and both the first and second sides are wavy; the body portion comprises a plurality of conductive elements sequentially connected along the extending direction of the wiring structure; and in each conductive element, a length of a protruding portion on the first side in the extending direction of the wiring structure is different from that of a protruding portion on the second side in the extending direction of the wiring structure.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims the priority of Chinese PatentApplication No. 201710772275.0 filed on 31 Aug. 2017, the disclosure ofwhich is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to the field of display technology, andparticularly relates to a wiring structure, a display substrate and adisplay device.

BACKGROUND

For manufacturing flexible display devices, various display componentshave been developed for using organic materials, such as organiclight-emitting layers, organic passivation layers and polymer substrates(such as polyimide substrates) serving as flexible substrates. However,it is hard to replace a metal trace in a display with an organicmaterial, because conductivity of the organic material is much lowerthan that of the metal trace. When a flexible display device is bent,the metal trace in a display panel may be broken (with about 1% of thetrace broken due to strain), which will cause failure of the displaydevice.

SUMMARY

The present disclosure aims at solving at least one of the technicalproblems found in related art, and provides a wiring structure which isnot easily broken, a display substrate and a display device having thesame.

A technical solution directed to the technical problem of the presentdisclosure provides a wiring structure, including a body portionprovided with hollow patterns; the body portion has a first side and asecond side which are provided opposite to each other along an extendingdirection of the wiring structure, and both the first and second sidesare wavy; wherein,

the body portion includes a plurality of conductive elementssequentially connected along the extending direction of the wiringstructure; and in each conductive element, a length of a protrudingportion on the first side in the extending direction of the wiringstructure is different from that of a protruding portion on the secondside in the extending direction of the wiring structure.

According to embodiments of the present disclosure, in each conductiveelement, a curvature degree of the protruding portion on the first sideis different from that of the protruding portion on the second side.

According to embodiments of the present disclosure, every two adjacentprotruding portions on the first side have different curvature degrees;and/or every two adjacent protruding portions on the second side havedifferent curvature degrees.

According to embodiments of the present disclosure, each conductiveelement includes one protruding portion on the first side and oneprotruding portion on the second side.

According to embodiments of the present disclosure, a connection lineconnecting a connection point on the first side and a connection pointon the second side of two adjacent conductive elements extends along adirection which intersects with a direction perpendicular to theextending direction of the wiring structure.

According to embodiments of the present disclosure, every two adjacentconductive elements are centrally symmetrical to each other instructure.

According to embodiments of the present disclosure, each of the firstand second sides is provided with at least three protruding portionshaving different curvature degrees.

According to embodiments of the present disclosure, from at least onepair of two adjacent conductive elements of the body portion, one of thetwo adjacent conductive elements includes one protruding portion on thefirst side and two protruding portions on the second side, and the otherone of the two adjacent conductive elements includes two protrudingportions on the first side and one protruding portion on the secondside.

According to embodiments of the present disclosure, the conductiveelement including one protruding portion on the first side and twoprotruding portions on the second side and a conductive element adjacentto the conductive element and including two protruding portions on thefirst side and one protruding portion on the second side are centrallysymmetrical to each other in structure.

According to embodiments of the present disclosure, the wiring structureincludes a plurality of body portions; a first side of one of every twoadjacent body portions and a second side of the other of the twoadjacent body portions are joined together to form an integralstructure.

According to embodiments of the present disclosure, the hollow patternsin the two adjacent body portions are arranged in a stagger way.

According to embodiments of the present disclosure, each of theplurality of conductive element is provided with one hollow pattern.

According to embodiments of the present disclosure, the hollow patternhas a shape of any one of circles, ellipses, rectangles and rhombuses.

According to embodiments of the present disclosure, the conductiveelements are formed to be an integral structure.

The present disclosure further provides a display substrate, including abase and the aforesaid wiring structure provided thereon.

The present disclosure further provides a display device, including theaforesaid display substrate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1-3 are schematic diagrams of wiring structures according toembodiments of the present disclosure;

FIG. 4 is a schematic diagram of a wiring structure according to anotherembodiment of the present disclosure;

FIG. 5 is a schematic diagram of a wiring structure according to yetanother embodiment of the present disclosure.

DETAILED DESCRIPTION

In order to enable those skilled in the art to better understand thetechnical solutions of the present disclosure, the present disclosurewill be further described in detail below with reference to theaccompanying drawings and specific implementations.

As shown in FIGS. 1-5, embodiments of the present disclosure provides awiring structure. including a body portion provided with hollow patterns13. The body portion has a first side 11 and a second side 12 which areprovided opposite to each other along an extending direction of thewiring structure, and both the first side 11 and the second side 12 arewavy. The body portion includes a plurality of conductive elements 10sequentially connected along the extending direction of the wiringstructure. In each conductive element 10, a length of a protrudingportion on the first side in the extending direction of the wiringstructure is different from that of a protruding portion on the secondside in the extending direction of the wiring structure. Therefore, whenthe wiring structure is bent, a connection line connecting strainconcentration points will not be parallel to a bending line (a straightline where a crease is positioned when the wiring structure is bent), soas to prevent a crack formed by the bending from extending along adirection of the connection line connecting strain concentration points,thereby avoiding fracture of the wiring structure.

According to the embodiments of the present disclosure, in eachconductive element 10, a curvature degree of the protruding portion onthe first side 11 is different from that of the protruding portion onthe second side 12.

In the embodiment, both the first side 11 and the second side 12 of thebody portion of the wiring structure are wavy (i.e., each side iscomposed of a plurality of connected protruding portions), and acurvature degree of the protruding portion on the first side 11 isdifferent from that of the protruding portion on the second side 12 ineach conductive element 10 of the body portion, so that a bending forcecapable of being withstood by the protruding portion on the first side11 is different from that capable of being withstood by the protrudingportion on the second side 12 in each conductive element 10. Therefore,even if the protruding portion on one side of the conductive element 10breaks, connection of the wiring structure may still be maintained bythe protruding portion on the other side, so as to avoid failure of thewiring structure due to fracture caused by bend.

Any two adjacent protruding portions on the first side 11 of the bodyportion have different curvature degrees; and/or any two adjacentprotruding portions on the second side 12 have different curvaturedegrees. That is, any two adjacent protruding portions on at least oneof the first side 11 and the second side 12 have different curvaturedegrees. Since the protruding portions with different curvature degreesare capable of withstanding different bending forces, only part of theprotruding portions break even if a wiring structure is subject to arelatively great force while being bent. Similarly, since the curvaturedegree of the protruding portion on the first side 11 is different fromthat of the protruding portion on the second side 12 in a sameconductive element 10, the protruding portion on only one side breakseven if a wiring structure is subject to a relatively great force whilebeing bent, in which case the wiring structure is still capable oftransmitting signals normally, with its use not affected.

Each conductive element 10 is provided with a hollow pattern 13, whichmay release stress as much as possible when the wiring structure isbent, stretched or twisted, so as to avoid fracture of the wiringstructure, while ensuring high conductivity of the wiring structure. Thehollow pattern 13 may have a shape of an one of circles, ellipses (asshown in FIG. 2), rectangles and rhombuses, but not limited to the aboveshapes.

With specific implementations, the wiring structure according to theembodiments will be described below.

According to the embodiments of the present disclosure, as shown inFIGS. 1-3, the body portion of the wiring structure includes theconductive elements 10 sequentially connected along the extendingdirection of the wiring structure, wherein each conductive element 10 isprovided with one protruding portion on the first side 11 and oneprotruding portion on the second side 12. As shown in FIG. 3, aconnection line connecting a connection point on the first side 11 and aconnection point on the second side 12 of two adjacent conductiveelements 10 in the body portion extends along a direction whichintersects with a direction perpendicular to the extending direction ofthe wiring structure, that is, in one conductive element 10, a length ofthe protruding portion on the first side 11 in the extending directionof the wiring structure may be smaller than that of the protrudingportion on the second side 12 in the extending direction of the wiringstructure. The connection point on the first side 11 (e.g., point a inFIG. 3) and the connection point on the second side 12 (e.g., point b inFIG. 3) of the two adjacent conductive elements 10 in the body portionare stress concentration points when the wiring structure is twisted,bent or stretched. Therefore, the connection line connecting the stressconcentration point (i.e., the point a) on the first side 11 and thestress concentration point (i.e., the point b) on the second side 12 ofthe two adjacent conductive elements 10 in the embodiment is notcoincident with a horizontal line (which indicates a straight lineextending in a direction perpendicular to the extending direction of thewiring structure). With such structure, when the wiring structure isbent, the connection line connecting the stress concentration points(i.e., the connection line connecting the points a and b) will not beparallel to a bending line (the dashed line in FIG. 3), so as to preventa crack formed by the bending from extending along the direction of theconnection line connecting the strain concentration points, therebyavoiding fracture of the wiring structure, which improves bendingresistance and reliability of the wiring structure. Especially forflexible substrates which are likely to be bent due to their ownproperties, yield of the flexible substrates may be greatly increased byadopting the wiring structure of the embodiment.

According to the embodiments of the present disclosure, in eachconductive element 10, the curvature degree of the protruding portion onthe first side 11 is different from that of the protruding portion onthe second side 12. The protruding portions of any two adjacentconductive elements 10 on the first side 11 have different curvaturedegrees, and the protruding portions of any two adjacent conductiveelements 10 on the second side 12 have different curvature degrees. Eachconductive element 10 is provided with one hollow pattern 13.Optionally, all of the conductive element 10 are formed as an integralstructure, which may facilitate manufacturing thereof and greatlyincrease production efficiency.

For obtaining a wiring structure with an even structure, each of thefirst side 11 and the second side 12 of the body portion may be providedwith two kinds of protruding portions having different curvaturedegrees. The protruding portions having different curvature degrees arealternately arranged on each side. Furthermore, the first side 11 andthe second side 12 are provided with the same kinds of protrudingportions (“same kinds” here indicate that, under the condition that theprotruding portions on the first side 11 and the second side 12 are ofan arc shape, for example, radii of curvature of the protruding portionson the first side 11 are 30 mm and 50 mm, while radii of curvature ofthe protruding portions on the second side 12 are also 30 mm and 50 mm).In such case, the two adjacent conductive elements 10 are centrallysymmetrical to each other.

According to another embodiment of the present disclosure, as shown inFIG. 4, the body portion of the wiring structure includes the conductiveelements 10 sequentially connected along the extending direction of thewiring structure, each of the first side 11 and the second side 12 ofthe body portion is provided with three kinds of protruding portionshaving different curvature degrees, the protruding portions of any twoadjacent conductive elements 10 on the first side 11 have differentcurvature degrees, and the protruding portions of any two adjacentconductive elements 10 on the second side 12 have different curvaturedegrees. Each conductive element 10 is provided with one hollow pattern13. Optionally, all of the conductive elements 10 are formed as anintegral structure, which may facilitate manufacturing thereof andgreatly increase production efficiency.

Specifically, as shown in FIG. 4, the configuration of some conductiveelements 10 in the body portion of the wiring structure are the same asthat in the aforesaid embodiments, one of two adjacent conductiveelements 10 among remaining conductive elements 10 includes oneprotruding portion on the first side 11 and two protruding portions onthe second side 12, and the other of the two adjacent conductiveelements 10 includes two protruding portions on the first side 11 andone protruding portion on the second side 12. Optionally, the conductiveelement 10 including one protruding portion on the first side 11 and twoprotruding portions on the second side 12 and a conductive element 10adjacent to the conductive element 10 and including two protrudingportions on the first side 11 and one protruding portion on the secondside 12 are centrally symmetrical to each other.

It should be noted that each of the first side 11 and the second side 12of the body portion may be provided with more protruding portions havingdifferent curvature degrees. Each conductive element 10 may not belimited to the above structures, and may include a plurality ofprotruding portions on the first side 11 and a plurality of protrudingportions on the second side 12, which will not be listed one by oneherein.

According to another embodiment of the present disclosure, a wiringstructure may be formed by joining together a plurality of wiringstructures of any one of the aforesaid kinds. As shown in FIG. 5, thewiring structure includes two body portions; wherein, a first side 11 ofone of the two body portions and a second side 12 of the other of thetwo body portions are joined together to form an integral structure.Optionally, as shown in FIG. 5, the hollow patterns 13 in the two bodyportions of the wiring structure are arranged in a stagger way, so thatnone of the hollow patterns in one body portion is aligned with a hollowpattern in the other body portion in a horizontal direction (i.e., adirection perpendicular to an extending direction of the wiringstructure). Such arrangement prevents a connection line connecting thehollow patterns 13 in the two body portions from being parallel to thebending line of the wiring structure, so as to avoid that the wiringstructure is likely to break while being bent.

As shown in FIGS. 1-5, for each conductive element 10 in the bodyportion of each aforesaid wiring structure, the length of the protrudingportion on the first side 11 in the extending direction of the wiringstructure is different from that of the protruding portion on the secondside 12 in the extending direction of the wiring structure, and theconnection line connecting the strain concentration point on the firstside 11 and the strain concentration point on the second side 12 of twoadjacent conductive elements 10 is not parallel to the bending line, soas to prevent a crack formed by the bending from extending along adirection of the connection line connecting the strain concentrationpoints, thereby avoiding fracture of the wiring structure, whichimproves bending resistance and reliability of the wiring structure.

Moreover, in each conductive element 10, the curvature degree of theprotruding portion on the first side 11 is different from that of theprotruding portion on the second side 12, so that the bending forcecapable of being withstood by the protruding portion on the first side11 is different from that capable of being withstood by the protrudingportion on the second side 12. Therefore, even if the protruding portionon one side of the conductive element 10 breaks, connection of thewiring structure may still be maintained by the protruding portion onthe other side, so as to avoid failure of the wiring structure due tofracture caused by bend.

The embodiment further provides a display substrate, including a baseand a wiring structure provided thereon, the wiring structure being anyone of the wiring structures according to the aforesaid embodiments.

The display substrate in the embodiment may be a flexible substrate,that is, the base thereof is made of a flexible material, such aspolyimide (PI).

In the embodiment, in a body portion of the wiring structure of thedisplay substrate, both a first side 11 and a second side 12 are wavy(i.e., each side is composed of a plurality of connected protrudingportions), and in one conductive element 10, a length of a protrudingportion on the first side 11 in an extending direction of the wiringstructure is smaller than that of a protruding portion on the secondside 12 in the extending direction of the wiring structure. With suchstructure, when the wiring structure is bent, a connection lineconnecting stress concentration points will not be parallel to a bendingline, so as to prevent a crack formed by the bending from extendingalong a direction of the connection line connecting the strainconcentration points, thereby avoiding fracture of the wiring structure,which improves bending resistance and reliability of the wiringstructure. Especially for flexible substrates which are likely to bebent due to their own properties, yield of the flexible substrates maybe greatly increased by adopting the wiring structure of the embodiment.

Furthermore, for each conductive element 10 in the body portion, acurvature degree of the protruding portion on the first side 11 isdifferent from that of the protruding portion on the second side 12, sothat a bending force capable of being withstood by the protrudingportion on the first side 11 is different from that capable of beingwithstood by the protruding portion on the second side 12. Therefore,even if the protruding portion having a smaller curvature degree in theconductive element 10 breaks, connection of the wiring structure maystill be maintained by the other protruding portion having a greatercurvature degree, so as to avoid failure of the wiring structure due tofracture caused by bend. Especially for flexible substrates which arelikely to be bent due to their own properties, yield of the flexiblesubstrates may be greatly increased by adopting the wiring structure ofthe embodiment.

The embodiment further provides a display device, including the displaysubstrate of the aforesaid embodiment, thereby having betterperformance.

The display device may be any product or component having a displayfunction, such as a liquid crystal panel, electronic paper, an OLEDpanel, a mobile phone, a tablet computer, a TV, a display, a laptop, adigital photo frame and a navigator.

It should be understood that the foregoing implementations are merelyexemplary implementations adopted for describing the principle of thepresent disclosure, but the present disclosure is not limited thereto.Those of ordinary skill in the art may make various variations andimprovements without departing from the spirit and essence of thepresent disclosure, and these variations and improvements shall beconsidered to fall into the protection scope of the present disclosure.

1. A wiring structure, comprising at least one body portion providedwith hollow patterns, wherein each body portion of the at least one bodyportion has a first side and a second side which are provided oppositeto each other along an extending direction of the wiring structure, andboth the first and second sides are wavy; and the body portion comprisesa plurality of conductive elements sequentially connected along theextending direction of the wiring structure; and at least one conductiveelement of the plurality of conductive elements each comprises at leastone protruding portion on the first side and at least one protrudingportion on the second side, and a length of the at least one protrudingportion on the first side is different from that of the at least oneprotruding portion on the second side in the extending direction of thewiring structure.
 2. The wiring structure of claim 1, wherein in each ofthe at least one conductive element, a curvature degree of theprotruding portion on the first side is different from that of theprotruding portion on the second side.
 3. The wiring structure of claim1, wherein any two adjacent protruding portions on the first side havedifferent curvature degrees.
 4. The wiring structure of claim 1, whereinany two adjacent protruding portions on the second side have differentcurvature degrees.
 5. The wiring structure of claim 1, wherein any twoadjacent protruding portions on the first side have different curvaturedegrees, and any two adjacent protruding portions on the second sidehave different curvature degrees.
 6. The wiring structure of claim 3,wherein each of the at least one conductive element comprises oneprotruding portion on the first side and one protruding portion on thesecond side.
 7. The wiring structure of claim 6, wherein every twoadjacent conductive elements are centrally symmetrical to each other instructure.
 8. The wiring structure of claim 3, wherein each of the firstand second sides is provided with at least three protruding portionshaving different curvature degrees.
 9. The wiring structure of claim 8,wherein from at least one pair of two adjacent conductive elements inthe body portion, one of the two adjacent conductive elements comprisesone protruding portion on the first side and two protruding portions onthe second side, and the other of the two adjacent conductive elementscomprises two protruding portions on the first side and one protrudingportion on the second side.
 10. The wiring structure of claim 9, whereinthe conductive element comprising one protruding portion on the firstside and two protruding portions on the second side and the otherconductive element adjacent to the conductive element and comprising twoprotruding portions on the first side and one protruding portion on thesecond side are centrally symmetrical to each other in structure. 11.The wiring structure of claim 1, wherein the wiring structure comprisesa plurality of body portions, and a first side of one of every twoadjacent body portions and a second side of the other of the twoadjacent body portions are joined together to form an integralstructure.
 12. The wiring structure of claim 11, wherein the hollowpatterns in the two adjacent body portions are arranged in a staggerway.
 13. The wiring structure of claim 1, wherein each of the pluralityof conductive elements is provided with one hollow pattern.
 14. Thewiring structure of claim 1, wherein the hollow pattern has a shape ofone of circles, ellipses, rectangles and rhombuses.
 15. The wiringstructure of claim 1, wherein the plurality of conductive elements areformed to be an integral structure.
 16. A display substrate, comprisinga base and a wiring structure provided on the base, wherein the wiringstructure is the wiring structure of claim
 1. 17. A display device,comprising a display substrate, wherein the display substrate is thedisplay substrate of claim
 16. 18. The wiring structure of claim 4,wherein each of the at least one conductive element comprises oneprotruding portion on the first side and one protruding portion on thesecond side.
 19. The wiring structure of claim 5, wherein each of the atleast one conductive element comprises one protruding portion on thefirst side and one protruding portion on the second side.
 20. The wiringstructure of claim 4, wherein each of the first and second sides isprovided with at least three protruding portions having differentcurvature degrees.